Edwards, S. N. a., McLaughlin, W. J., & Ham, S. H. (1999). Comparative study of ecotourism policy in the americas: Latin America and the Caribbean (Primera edición.). OEA, University of Idaho.

Edwards, Stephen N. autor, William J. McLaughlin, and Sam H. Ham. Comparative Study of Ecotourism Policy in the Americas: Latin America and the Caribbean. Primera edición. Washington: OEA, University of Idaho, 1999.

Edwards, Stephen N. autor, et al. Comparative Study of Ecotourism Policy in the Americas: Latin America and the Caribbean. Primera edición. OEA, University of Idaho, 1999.